+1 to Zib's comment
Save it for knives, or sell it on ebay then look for an inexpensive Barber Hone as a replacement.
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I finally made out the writing on it!
The below thread should be informative
http://straightrazorpalace.com/hones...ing-stone.html
I will say one thing and you can do what you will with it. There have been many times during my honing experiences where I have cursed myself for not having a courser hone. Little chips in razors take an awful lot longer to get out than I had once previously estimated. Metaphorically speaking, I think there is something to be said for having a big ugly fullback to pave the way for the flashy tailback.
I have the same stone. I wouldn't suggest using it on razors, but to each his own. There's a guy using a little 1200 grit diamond pocket stone, and a barber hone that seems to be doing just fine with that set up. I'd have never considered it if he hadn't posted it. The worst that happens is you wreck your edge and have to start over. Regardless, we aren't working with gold dust here. You can get another razor for little to nothing, in the event that you worked it all the way down to the spine without noticing. But something tells me you're more observant than that.